Telephone-transmitter cut-out.



O. M.-HARTNETT. TELEPHONE TRANSMITTER GUT-OUT. APPLIGATIONIILBD MAY 31, 1910.

985,169. Patented Feb.28,1911.

m f 6 ZQM usual metallic pill-an which supports' lthe a To these ends, the inventionconsists UNITED STATES-{PATENT OFFICE.

- onarsrornsam. HABTNEIT, or MALDEN, masssonusnn'rsl 'rnLnrnoimanansmrrrnn our-our.

To all-whom. it 'may concern: 2 Q

Be it known that I, Cmusrornrn .M. of-Malden, in the county of Mid 'dlese'x and Stateof Maachusetts, have inis intuse the; user may temporarily render the transmitter inoperative while the rec'eiverisstill in circuit,-the purpose being to 'cut'ofi from the party at the other end of the line all at the transmitter which is thirsirendered inoperative. I

f The-object is further toprovide a desk set-telephone instrument having transmitter short-c1rcuitl1ig'means,v embodying a springsupported button. located adjacent to t transmitter, the button being arranged to be premed into contact-with said pillar b the thumbofthehand-whichholds the p at.

broadly in a telephone havingmeans wherethe transmitter may be 'short-circuited phone havingwametallic support for the transmitter, which support forms one-of the conductors ofthe circuit and "another,;-conductor adaptedfio hemoved into and out of contact. with' -said support 7 and electrically connected; to the transmitter, whereby theother words, out out of operation at The invention finally consists in the-novel pointed out in the claims.

Referring to the l is an elevation of a portionyof ausual 'and'well known, desk set telephone" instrument towhich is applieda transmitter'cut-out em bodying my invenitiongfFig. 2 is an enlarged sectional View taken on line of Fig; 1, looking toward left. Fig. 3; is a central verticalsectional View of the push utton-showing its method; of attachment with its spring andnith the conductor wh ch leads to the transmitter. Fig.

4 is a diagram showing a pair of telephone Specification 0t Letters j Patent, Application filed Ma 31,1910. ,SeriaLNo. 564,221: v

Theinventionconsists further in a .tele

instruments connected-in circuit- 1n the usual and well known ma u 'ei each-having con;

nected thereto a"u-ansmiuerieut outfl Like numerals 'refer-tojlikefpatts through out the several views of the drawings.

In the drawings, 5 is a telephone; trans-' mitter of usual and well knownconstruction se-tire having a metallic casing 6 sup orted upo a metallic column 7 in the usualan'tl well known manner, As is well known to those skilled in the art, one of thetermin'alsof the transk ,niitter is'groundedupon "itsinet'al casing,"

while the other has conn'ec'tdfthereto an insulate'd conductor whichpa'sses intothe tenor of the supporting column, this conductor belng 1ndicatedjat S in the drawings and provided witha metallic tip-" 9 xtending .into the transmitter casingfithrough an insulating bushing 10; To this metallic an insulated conductor 111 is'jelectrically connected by a grip 12'emjbracing said ti and manner as, for example, I shown in Fig. 2, theconnecti'on being prefer: ably covered by a rubber sleeve, 13. "1 The lower end of the conductor 11 is chic secured to; said conductor; any: su table by, qld mg, "a

--trica1ly connected to apus h;butto .fd 'i p,

Inated generally by the I p I button having a metallie -fcontact "member numer l-1s ai DPT-Sh i ;:my suitable ma'nneghsfby soldering,

shown in 3. ,Th1scontact. -n1e nber'maj7',

in practice, consist of a see-provided with at itsz'upper'end to a clamping ring 18 Surrounding-said column, thelower end of --said:spring being bent to form an eye which surrounds an insulating sleeve 19 providediwith an annular groove 20 in which saidspring is locatedysaid sleeve surroundingflthe contact member 15 between the con-' luctor fll and the head 16.

The conductor 11- is provided adjacent to its lower end with a r ubber sleeve 21 ism-rounding the same and said conductor issccured-to'tho spring 1? by a suitable me- -tallic sleeve 2 surrounding said conductor and said spring; The push button ll is located adjacent to the' enlarged partof the meta 'c column -7' :0 as to be read ly b the thumb ofthe hand which holds the column in the usual manner andthe contact member 15 is normally held out of contact with said column by the spring 1 7:, as shown in,Fig.-1. v When the telephone is in use, the user may short-circuit the transmitter at will bypress 'ing the push button 14 to carry the" contact member 15 into contact with the column 7,

thus rendering the transmitter inoperative while the receiver is still in, circuit and in this manner cutting off from the party atthe other end of the line all sounds at the transmitterwhich is thus rendered inoperative.

The instruments at the two'stations will, of course, be connected, by the customary and well known wiring, as shown in diagram in' Fig. 4, in which itis evident that ductor adapted tube-{moved into and out of contact with sa support whereby said transmitter may be short-circuited at Willi 2. A telephone having, in combination, a transmitter, a metallic support for said transmitter, a conductor connected to said transmitter but insulated from said support, a receiver in circuit withsaid transmitter through said conductor and said support,

and means adapted to be operated at will to electricall connect .said conductor to-said' support 1; erby'to short circuit said. trans-,. m tten 3. A telephone -havingfln combination, a transmitter, ,a metallic .siipport for said.

transmitter, a conductor connected to said transmitter-but insulated from said support, a receiver 1n circuit with said transmitter through said conductor and said support, a

secondconductor adapted to be operated at will to electrically connect the first-men-s .tioned, conductor to said support'thereby to short circuit said transmitter, and yielding means acting to normally hold said see- 0nd conductor out of electrical connection with said support.

'4. A telep one instrument having, in combination, a transmitter, a conductor connected to said transmitter, a metallic support for said transmitter, a contactmember, a spring on which. said contactfmember is supported normally. out of contact with said support,

and a second conductorconnecting said memher to the first-mentioned conductor.

i 5. A telephone instrument having, in combination, a transmitter, a-conductor connected to said transmitter, a vertical metallic pillar constituting a support for said trans mitter, a contact member, a spring on which said contact member s supported normaly out of'contact with sald support, said mem her. being insulated fromsaid spring and a second conductor connecting said member to the first-mentioned conductor.

In testimony whereof-I have aflixed my signature, in presence oftwo witnesses.

. CHRISTOPHER M. HARTNETT. Witnesses Tno ms P. RILEY,- KATHERINE F. REILLY. 

